#define	_CRT_SECURE_NO_WARNINGS 1

#include "Stack.h"

//void StackPrint(ST* ps)
//{
//	while (!StackEmpty(ps))
//	{
//		printf("%d ", StackTop(ps));
//		StackPop(ps);
//	}
//	printf("\n");
//
//}

void StackInit(ST* ps)
{
	assert(ps);

	ps->a = NULL;
	ps->top = 0;
	ps->capacity = 0;
}

void StackDestory(ST* ps)
{
	assert(ps);

	free(ps->a);
	ps->a = NULL;
	ps->top = 0;
	ps->capacity = 0;
}


void StackPush(ST *ps, STDataType x)
{
	assert(ps);

	if (ps->top == ps->capacity)
	{
		int newCapacity = ps->capacity == 0 ? 4 : ps->capacity * 2;
		STDataType* tmp = realloc(ps->a, sizeof(STDataType) * newCapacity);
		if (tmp == NULL)
		{
			printf("realloc fail\n");
			exit(-1);
		}
		else
		{
			ps->a = tmp;
			ps->capacity = newCapacity;
		}
	}
	ps->a[ps->top] = x;
	++ps->top;
}

void StackPop(ST* ps)
{
	assert(ps);
	assert(ps->top > 0);

	--ps->top;
}

bool StackEmpty(ST* ps)
{
	assert(ps);

	return ps->top == 0;
}

int StackSize(ST* ps)
{
	assert(ps);

	return ps->top;
}

STDataType StackTop(ST* ps)
{
	assert(ps);
	assert(ps->top > 0);

	return ps->a[ps->top - 1];
}